The quenched surface characteristics and flame structure of RDX-CMDB propellants containing single lead salt,or Pb/C binary catalysis system,or Pb/Cu/C tribasic catalysis system were investigated. It is found that different catalyst systems bring about different types and sizes of characteristic substances borned on the quenched surface of the propellants, and different geometrical shapes and brightness of the luminous substances on the combustion surface.The flame of the propellant becomes much brighter with the pressure increase.